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#include <fstream>
using namespace std;
ifstream cin("consecutive.in");
ofstream cout("consecutive.out");
int v[1001],w[1001];
int main()
{
int n,m,t,s,r;
cin>>t;
while(t--)
{
r=0;
s=0;
cin>>n;
for(int i=2;i*i<=n*2;i++)
{
if((n*2)%i==0)
{
m=((2*n)/i-i+1)/2;
s=((2*m+i-1)*i)/2;
if(s==n)
{
r++;
v[r]=m;
w[r]=m+i-1;
}
}
}
cout<<r<<'\n';
for(int i=1;i<=r;i++)
cout<<v[i]<<' '<<w[i]<<'\n';
}
return 0;
}